<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>

		<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
	</head>
	<body>
		<div id="app">
			<input type="text" v-model="num1" />
			<select v-model="op">
				<option>+</option>
				<option>-</option>
				<option>*</option>
				<option>/</option>
			</select>
			<input type="text" v-model="num2" />
			<button v-on:click="calc">=</button>
			<input type="text" v-model="result" />
		</div>
		
		<script>
			// 第三步: 创建一个Vue的实例对象
			var app = Vue.createApp({
				data() {
					return {
						num1:'',
						num2:'',
						result:'',
						op:''
					}
				},
				methods:{
					calc:function()
					{
						console.log("执行计算")
						
						console.log(this.op)
						
						if(this.op=='+')
						{
							var x = parseInt(this.num1)
							var y = parseInt(this.num2)
							var z = x+y;
						}
						else if(this.op=='-')
						{
							var x = parseInt(this.num1)
							var y = parseInt(this.num2)
							var z = x-y;
						}
						else if(this.op=='*')
						{
							var x = parseInt(this.num1)
							var y = parseInt(this.num2)
							var z = x*y;
						}
						else if(this.op=='/')
						{
							var x = parseInt(this.num1)
							var y = parseInt(this.num2)
							var z = x/y;
						}
						
						this.result = z;
					}
				}
			});
			// 第四步: 把app挂载到视图上
			var vm = app.mount("#app")
		</script>



	</body>
</html>